Question: When did Elon Musk marry his spouse Justine Musk?
Paraphrase: On what date did Elon Musk marry his wife Justine Musk?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q317521 p:P26 ?s . ?s ps:P26 wd:Q6318376 . ?s pq:P580 ?value}